My Win 7 system boots from nr 1 HDD and I have another 2TB HDD with (precious !) data. This 2nd HDD was originally created in Win XP. When I first connected it to the PC Win 7 did not pick it up. That was fixed (I forgot what I did then). Now, after working fine for some time, Windows does not show the 2nd drive. It is shown in Disk Management as "Dynamic" and "Invalid". So what do I do now the get access to this drive? Any lost of data is not acceptable.